<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>动画实现步骤</title>
    <style>
      .box {
        width: 200px;
        height: 100px;
        background-color: pink;
        
        animation: change 1s;
      }

      /* 动画一：宽度从200变化到800 */
      /* @keyframes change {
        from{
          width: 200px;
        } 
        to{
          width: 800px;
        }
      } */


      /* 动画二：从 200*100 变化到 300*300 变化到800*500 */
      /* 百分比：表示的意思是动画时长的百分比 */
      @keyframes change {
        0% {
          width: 200px;
          height: 100px;
        }
        25% {
          width: 300px;
          height: 300px;
        }
        100% {
          width: 800px;
          height: 500px;
        }
      }

    </style>
  </head>
  <body>
    <div class="box"></div>
  </body>
</html>
